//
// detail/reactor_op.hpp
// ~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_DETAIL_REACTOR_OP_HPP
#define ASIO_DETAIL_REACTOR_OP_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include "asio/detail/operation.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
    namespace detail {

        class reactor_op
                : public operation {
        public:
            // The error code to be passed to the completion handler.
            asio::error_code ec_;

            // The operation key used for targeted cancellation.
            void *cancellation_key_;

            // The number of bytes transferred, to be passed to the completion handler.
            std::size_t bytes_transferred_;

            // Status returned by perform function. May be used to decide whether it is
            // worth performing more operations on the descriptor immediately.
            enum status {
                not_done, done, done_and_exhausted
            };

            // Perform the operation. Returns true if it is finished.
            status perform() {
                return perform_func_(this);
            }

        protected:
            typedef status (*perform_func_type)(reactor_op *);

            reactor_op(const asio::error_code &success_ec,
                       perform_func_type perform_func, func_type complete_func)
                    : operation(complete_func),
                      ec_(success_ec),
                      cancellation_key_(0),
                      bytes_transferred_(0),
                      perform_func_(perform_func) {
            }

        private:
            perform_func_type perform_func_;
        };

    } // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_DETAIL_REACTOR_OP_HPP
